# energy_low(keV)  energy_high(keV)  fractional_rms  fractional_rms_error
     0.300000          0.460000         0.0529936        0.00254478    
     0.460000          0.700000         0.0589750        0.00273896    
     0.700000           1.00000         0.0680505        0.00346729    
      1.00000           1.54000         0.0764139        0.00408837    
      1.54000           2.40000         0.0849014        0.00596389    
      2.40000           4.80000         0.0809118        0.00881405    
      4.80000           10.0000         0.0671561         0.0214069